SEOUL — North Korea claimed Sunday that it could wipe out Manhattan by sending a hydrogen bomb on a ballistic missile to the heart of New York City, the latest in a string of brazen threats.

Although there are many reasons to believe that Kim Jong Un’s regime is exaggerating its technical capabilities, the near-daily drumbeat of boasts and warnings from North Korea underlines its anger at efforts to thwart its ambitions.

“Our hydrogen bomb is much bigger than the one developed by the Soviet Union,” DPRK Today, a state-run outlet, reported Sunday. DPRK stands for the Democratic People’s Republic of Korea, North Korea’s official name.

“If this H-bomb were to be mounted on an intercontinental ballistic missile and fall on Manhattan in New York City, all the people there would be killed immediately and the city would burn down to ashes,” the report said, citing a nuclear scientist named Cho Hyong Il.

On Jan. 6, North Korea announced that it successfully tested a hydrogen bomb. Experts say it appeared to be a less powerful atomic device. However, a hydrogen bomb detonation would mean North Korea has taken a huge step forward in their nuclear capability. (Daron Taylor/The Washington Post)

The website is a strange choice for making such a claim, given that it also carries reports about such topics as rabbit farming and domestically made school backpacks.

“The H-bomb developed by the Soviet Union in the past was able to smash windows of buildings 1,000 kms away and the heat was strong enough to cause third-degree burns 100 kms away,” the report continued. (A thousand kilometers is about 625 miles; 100 kilometers, about 62.5 miles.)

Kim in January ordered North Korea’s fourth nuclear test and claimed that it was a hydrogen bomb, not a simple atomic one. But most experts are skeptical of the claim, saying the seismic waves caused by the blast were similar to those produced by the North’s three previous tests.

North Korea has made advances in its intercontinental-ballistic-missile program, and though experts generally conclude that the United States’ West Coast could be within reach, there has been no suggestion that the North would be able to hit the East Coast.

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What life looks like inside North Korea

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Scenes from inside the hermit kingdom.

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Scenes from the hermit kingdom.

April 14, 2016A girl dances ballet at the Mangyongdae Children’s Palace in the Pyongyang suburbs. The large facility, opened in 1989, has hundreds of rooms for various activities, including mathematics, chemistry, computer science, sports, music and dance practice.Franck Robichon/European Pressphoto Agency

Many experts are also skeptical of the “miniaturized warhead” that Kim showed off last week during a visit to a nuclear weapons plant.

But Jeffrey Lewis, director of the East Asia nonproliferation program at the Middlebury Institute of International Studies at Monterey, warned against dismissing the claim too soon.

“It does not look like U.S. devices, to be sure, but it is hard to know if aspects of the model are truly implausible or simply that North Korean nuclear weapons look different than their Soviet and American cousins,” Lewis wrote in an analysis for 38 North, a website devoted to North Korea. “The size, however, is consistent with my expectations for North Korea.”

As international condemnation of the North’s acts mounted, culminating this month in the United Nations’ toughest sanctions yet against Pyongyang, Kim’s regime has become increasingly belligerent, firing missiles into the Sea of Japan — also known as the East Sea — and issuing a new threat or denunciation almost every day.

The sanctions coincide with annual spring drills between the U.S. and South Korean militaries, which Pyongyang considers a rehearsal for an invasion. The ongoing exercises are viewed as particularly antagonistic because special forces are practicing “decapitation strikes” that target Northern leaders and the destruction of Pyongyang’s nuclear and missile sites.

On Friday, North Korea’s state media reported that Kim ordered more nuclear tests, while the North’s Korean People’s Army warned in a statement Saturday that it would counter the drills by “liberat[ing] the whole of South Korea including Seoul . . . with an ultra-precision blitzkrieg strike of the Korean style.”

South Korea’s Defense Ministry urged Pyongyang to stop its threats and provocations.

“If the North continues to make provocations despite the stern warnings made by our military, it is inevitable for us to roll out a strict response that may lead to the destruction of the Pyongyang regime,” South Korea’s Joint Chiefs of Staff said in a statement, according to the Yonhap News Agency.